#region The MIT License
// The MIT License
// 
// Copyright (c) 2011 octalforty studios
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#endregion
using System.IO;
using octalforty.Staytuned.ComponentModel;
using octalforty.Staytuned.ObjectModel;

using System.Linq;

namespace octalforty.Staytuned.Impl.ComponentModel.Fs
{
    /// <summary>
    /// 
    /// </summary>
    /// <remarks>
    /// <see cref="FsTemplateProviderModule"/> reads templates from following locations in turn:
    /// <list type="bullet">
    ///     <item><c>rootPath\&lt;eventDescriptor>\&lt;addressDescriptor.Scheme></c></item>
    ///     <item><c>rootPath\&lt;eventDescriptor></c></item>
    /// </list>
    /// 
    /// </remarks>
    public class FsTemplateProviderModule : ITemplateProviderModule
    {
        #region Private Members
        private readonly string rootPath;
        #endregion

        #region Public Properties
        /// <summary>
        /// Gets or sets a reference to the <see cref="IFsTemplateReader"/> used to read templates.
        /// </summary>
        public IFsTemplateReader FsTemplateReader
        { get; set; }
        #endregion

        /// <summary>
        /// Initializes a new instance of the <see cref="FsTemplateProviderModule"/> class.
        /// </summary>
        /// <param name="rootPath"></param>
        public FsTemplateProviderModule(string rootPath)
        {
            this.rootPath = rootPath;
        }

        #region ITemplateSelectorService Members
        public Template GetTemplate(string eventDescriptor, RecipientDescriptor recipient)
        {
            var probePaths = new[] {
                Path.Combine(Path.Combine(rootPath, eventDescriptor), recipient.Address.Scheme),
                Path.Combine(rootPath, eventDescriptor)
            };

            var path = probePaths.FirstOrDefault(pp => FsTemplateReader.TemplateExists(pp));
            return path == null ?
                null :
                FsTemplateReader.ReadTemplate(path);
        }
        #endregion
    }
}